Hi javascript learners why this short code prints such strange value.

Question

for(i=1; i<10; i+=3){}
console.log(i);//output = 10

for(i=1; i<10; i+=5){}
console.log(i);//output = 11

Answer 1

Hey, the thing is, you should use let or var here.

for(let i = 1; i < 10; i += 3) {
// Now i is only accessible inside these curly braces. The output was strange coz you were making a global variable, without the keyword let or var.
}

Answer 2

for(i=1;i<10;i+=5{}
is the same as

i=1
while(i<10)
{i+=5}

so lets look.
At first i is 1 and therefore smaller 10.
Then i is 6 and still smaller 10.
Then i is 11 and not smaller 10 anymore. While-loop ends with i =11

So, where is is strange?

Answer 3

Thank you all i just got what was wrong with me, simple, I put it outside the curly braces, while i wanted to print i loops, I've been doing and learning javascript for few months